Add camp spot parsing and BotGetNextCampSpotGoal

[themuffinator]

Motivation

• Restore retail-like camp spot support by parsing info_camp entities from the BSP entity lump into AAS state so bots can iterate map-defined camp positions.
• Provide a library-facing iterator to enumerate configured camp spots in the same resumable style used by other goal helpers.

Description

• Add aas_campspot_t and fields aasworld.campSpots / aasworld.numCampSpots to src/botlib/aas/aas_local.h to store parsed camp spots.
• Implement AAS_ParseVectorValue and origin handling in AAS_ParseEntityKeyValue, and register camp spots via AAS_RegisterCampSpot called from AAS_ParseEntityLump in src/botlib/aas/aas_map.c.
• Free camp spot list during world cleanup in AAS_ClearWorld to avoid leaks and keep map reload semantics consistent.
• Add BotGetNextCampSpotGoal to src/botlib/ai_goal/bot_goal.c and declare it in bot_goal.h to iterate camp spots and return a bot_goal_t with origin and computed areanum.

Testing

• No automated tests were executed for this change.
• Changes were committed locally (no build or CI run performed as part of this PR).
• Manual static review verified parsing integrates into AAS_ParseEntityLump and that the camp-spot list is cleared on world reset.
• Further validation recommended: run full build and map-load integration tests to confirm spots are discovered and BotGetNextCampSpotGoal returns expected goals.

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Codex Task